MGT3002 Week 1 Discussion

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The symbol ∩ shows the _____.

a. intersection of events

b. sum of the probabilities of events

c. union of events

d. None of these answers are correct

The sum of deviations of the individual data elements from their mean is _____.

a. always equal to zero

b. always less than zero

c. sometimes greater than and sometimes less than zero, depending on the data elements

d. always greater than zero

If P(A) = .80, P(B) = .65, and P(A ∩ B) = .78, then P(B | A) = _____.

a. .8375

b. .6700

c. .9750

d. Not enough information is given to answer this question.

Exhibit 3-3 Suppose annual salaries for sales associates from Hayley's Heirlooms have a bell-shaped distribution with a mean of $32,500 and a standard deviation of $2,500. The z-score for a sales associate from this store who earns $37,500 is _____.

a. −2

b. 2

c. 37.5

d. .92

Excel's _____ function can be used to compute the mean.

a. MODE

b. AVERAGE

c. MAX

d. MEDIAN

The 50th percentile is the _____.

a. mode

b. third quartile

c. median

d. mean

If A and B are independent events with P(A) = .2 and P(B) = .6, then P(A ∪ B) = _____.

a. .12

b. .62

c. .60

d. .68

Which of the following symbols represents the mean of a sample?

a. x̄

b. σ 2

c. μ

d. σ

The variance of a sample or a population cannot be _____.

a. negative

b. less than1

c. calculated

d. zero

One of the basic requirements of probability is _____.

a. for each experimental outcome Ei, we must have P(Ei) ≥ 1

b. P(A) = P(Ac) – 1

c. if there are k experimental outcomes, then P(E1) + P(E2) + ... + P(Ek) = 1

d. both P(A) = P(Ac) − 1 and if there are k experimental outcomes, then P(E1) + P(E2) + ... + P(Ek) = 1